Let x₁, x₂, x₃ be a random sample of size 3 from the distribution with pmf P(x) = 1/4, x = 1,2,3,4. What is the probability function for this distribution?
a) P(x) = 1/4
b) P(x) = 1/12
c) P(x) = 1/16
d) P(x) = 1/64